Test of JavaScript Scope

gistfile1.js

// test
var testScope = function(outer, inner, a, b, c) {
  test("", function() {
    assert(outer === "function", "outer() is in scope");
  });
  test("", function() {
    assert(inner === "function", "inner() is in scope");
  });
  test("", function() {
    assert(a === "number", "a is in scope");
  });
  test("", function() {
    assert(b === "number", "b is in scope");
  });
  test("", function() {
    assert(c === "number", "c is in scope");
  });
};

window.onload = function() {

  test("--- before outer ---", function() {
    testScope(typeof outer, typeof inner, typeof a, typeof b, typeof c);
  });

  function outer() {

    test("-- in outer, before a ---", function() {
      testScope(typeof outer, typeof inner, typeof a, typeof b, typeof c);
    });

    var a = 1;

    test("--- in outer, after a ---", function() {
      testScope(typeof outer, typeof inner, typeof a, typeof b, typeof c);
    });

    function inner() {}

    var b = 2;

    test("--- in outer, after inner() and b ---", function() {
      testScope(typeof outer, typeof inner, typeof a, typeof b, typeof c);
    });

    if (a == 1) {
      var c = 3;

      test("--- in outer, in if block ---", function() {
        testScope(typeof outer, typeof inner, typeof a, typeof b, typeof c);
      });
    }

    test("--- in outer, after c ---", function() {
      testScope(typeof outer, typeof inner, typeof a, typeof b, typeof c);
    });
  }

  outer();

  test("--- after outer ---", function() {
    testScope(typeof outer, typeof inner, typeof a, typeof b, typeof c);
  });
}